Solid-state devices that mimic biological motors can be built using magnetic flux quanta, or vortices. A new proposal describes how to transfer energy between two interacting vortex systems in a superconductor without having to physically 'sculpt' the host material.
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D'Anna, G. Controlling the motion of quanta. Nature Mater 1, 143–144 (2002). https://doi.org/10.1038/nmat751
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